Subject: Re: [PATCH net-next] ipv6: export IP6_RT_PRIO_* to userland

From: Nicolas Dichtel <[email-masked]>
Date: Mon, 05 Nov 2012 18:22:39 +0100

Le 05/11/2012 18:00, David Miller a écrit :
> From: Nicolas Dichtel <[email-masked]>
> Date: Mon,  5 Nov 2012 16:28:18 +0100
>
>> The kernel uses some default metric when routes are managed. For example, a
>> static route added with a metric set to 0 is inserted in the kernel with
>> metric 1024 (IP6_RT_PRIO_USER).
>> It is useful for routing daemons to know these values, to be able to set routes
>> without interfering with what the kernel does.
>>
>> Signed-off-by: Nicolas Dichtel <[email-masked]>
>
> But these belong in the libc headers anyways.
>
> If we haven't provided them for so long, there's no real value of
> adding them now.
>
But how can a daemon know which default values are used? If it wants to add a 
route with metric = default + x, it should first add it with metric = 0, check 
the result and then change the metric.